Ford Mustang: oil pressure, oil pressure, rocker arms

Question
freshly rebuilt 302 ford v-8,had local shop install new rocker arms and on my way home oil pressure started out normal,60 pounds.the warmer the engine got the lower the oil pressure,at red light had to pat the gas to keep it 10 to 20 lbs,if i didnt it would go real low and make a lot of noise.what do you think is wrong.  

Answer
Did you check to make sure you aren't low on oil?  It is normal for the oil pressure to drop as the engine heats up.  When got on the gas to drive what would you be at?  If you dont have a visible oil leak and you dont need to add oil I would take it back to the shop.